正则表达式拆分为特定字符

Question

I'm trying to make my string split on any Non Word Characters (\\W) including spaces but not including these characters : . , _ , $ . also I'm trying to keep any delimiters of Regex.Split except for spaces

how i can do that? i've read on many questions but it doesn't make sense. here is my latest code :

string[] result = Regex.Split (source, @"(\W[^(.|_|#|$)])");

EDIT :

an example here

      using System.Text;

i want :

using _ System.Text _ ;

(current) result is :

_ _ using _ System.Text _ ; _

Answer 1

You can use the following .NET-specific [\\W-[._$#\\s]])|\\s+ regex and leverage the C# LINQ to remove empty array items:

var txt = "      using System.Text;";
var splts = Regex.Split(txt, @"([\W-[._$#\s]])|\s+").Where(s => s != String.Empty).ToArray(); 

Output:

The regex - [\\W-[._$#\\s]])|\\s+ - uses a character class subtraction that is way more efficient than look-arounds as it leverages all optimizations of .NET regex engine. [\\W-[._$#\\s]] means any non-word character excluding . , _ , $ , # , whitespace .

Answer 2

(?!\.|#|_|\$|\s)(\W)|\s+

试试看， lookahead将确保它不会被那些字符分开。